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<p class="MsoNormal">Dear all.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Regarding action 31: <i>Look at implementation of epoch time system in abstract type, convey preference to Colin</i><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The following figure (and attached schema) describes the provisional/proposed implementation of the event type and epoch type (this last subject of the action) for the NAV-WG.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The event abstract type is defined consistently with the definition by CSS<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Regarding the child elements (i.e. user, earliestOffset, …)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Capitalisation may be subject of discussion<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Event type is derived from this abstract type such that the even name (e.g. AOS, LOS, ASCENDING_NODE, etc.) become the element tag. An example of the event for ASCENDING_NODE derived from the abstract type
is given in an below.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">The choice of time type<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Absolute: <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">extension of the existing ndm:epochType that already supports CSCSDS codes A/B in UTC
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">the extension provides the specific definition of the time scale to be used<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">ndm:epochType replaces the <i>AbstractEventTime
</i> in the CSS UML definition with (hopefully) no lack of generality <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Relative:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Explicitly built for the NAV-WG but in line with the principles in the CSS UML design.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span lang="EN-GB" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">It does not derive from an abstract type but preserves the underlying structure. In particular is to be noted that the attribute
<i>epochTimesystem </i>cannot be given directly in the RELATIVE_EPOCH element as the time scale is imposed by the two times in the children: either the time scale in the event defined by EVENT_IDENTIFIER or the time scale in the absolute time provided in EPOCH.
<i>This must require some discussion internally in the NAV-WG because it is not exactly what was agreed, but this has just been observed in this detailed design.</i><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Colin: the purpose of the action was to address the implementation of the time types. I think this does; please tell me otherwise. If at the same time you have any comments on the rest, I’ll appreciate to have them.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Fran<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"><img width="1251" height="1198" id="Picture_x0020_1" src="cid:image002.png@01D401BA.F603DC60"></span><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"><img width="971" height="681" id="Picture_x0020_2" src="cid:image001.png@01D401BC.C0FB96A0"></span><span lang="EN-GB"><o:p></o:p></span></p>
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